how does this go?

[Unregistered]

the sentence is, are we really too old to play outside?.....is that how it goes or is the first letter captilaized?

[amigos4]

The first word in a sentence is always capitalized. The correct format is: Are we too old to play outside?

[Anglika]

The sentence "Are we really too old to play outside?" is perfectly valid, if the questioner is seeking confirmation of the statement that they are too old.